Menarche: When Girls Typically Get Their First Period
Menarche (first period) typically occurs between ages 12–15.
- Average in U.S.: ~12.4 years
- Normal range: 9–16+ years
- Influencing factors: Genetics, ethnicity, body weight, nutrition, overall health, environmental exposures.
Early (<9) or delayed (>15–16) menarche warrants pediatric evaluation to rule out hormonal or developmental issues.
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